基于SSM+Layui的图书管理系统-SimpleCharVerifyCodeGenImpl验证码实现类.zip

package com.yx.codeutil; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Random; /** * 验证码实现类 */ public class SimpleCharVerifyCodeGenImpl implements IVerifyCodeGen { private static final Logger logger = LoggerFactory.getLogger(SimpleCharVerifyCodeGenImpl.class); private static final String[] FONT_TYPES = { "\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66" }; private static final int VALICATE_CODE_LENGTH = 4; /** * 设置背景颜色及大小，干扰线 * * @param graphics * @param width * @param height */ private static void fillBackground(Graphics graphics, int width, int height) { // 填充背景 graphics.setColor(Color.WHITE); //设置矩形坐标x y 为0 graphics.fillRect(0, 0, width, height); // 加入干扰线条 for (int i = 0; i < 8; i++) { //设置随机颜色算法参数 graphics.setColor(RandomUtils.randomColor(40, 150)); Random random = new Random(); int x = random.nextInt(width); int y = random.nextInt(height); int x1 = random.nextInt(width); int y1 = random.nextInt(height); graphics.drawLine(x, y, x1, y1); } } /** * 生成随机字符 * * @param width * @param height * @param os * @return * @throws IOException */ @Override public String generate(int width, int height, OutputStream os) throws IOException { BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics graphics = image.getGraphics(); fillBackground(graphics, width, height); String randomStr = RandomUtils.randomString(VALICATE_CODE_LENGTH); createCharacter(graphics, randomStr); graphics.dispose(); //设置JPEG格式 ImageIO.write(image, "JPEG", os); return randomStr; } /** * 验证码生成 * * @param width * @param height * @return */ @Override public VerifyCode generate(int width, int height) { VerifyCode verifyCode = null; try ( //将流的初始化放到这里就不需要手动关闭流 ByteArrayOutputStream baos = new ByteArrayOutputStream(); ) { String code = generate(width, height, baos); verifyCode = new VerifyCode(); verifyCode.setCode(code); verifyCode.setImgBytes(baos.toByteArray()); } catch (IOException e) { logger.error(e.getMessage(), e); verifyCode = null; } return verifyCode; } /** * 设置字符颜色大小 * * @param g * @param randomStr */ private void createCharacter(Graphics g, String randomStr) { char[] charArray = randomStr.toCharArray(); for (int i = 0; i < charArray.length; i++) { //设置RGB颜色算法参数 g.setColor(new Color(50 + RandomUtils.nextInt(100), 50 + RandomUtils.nextInt(100), 50 + RandomUtils.nextInt(100))); //设置字体大小，类型 g.setFont(new Font(FONT_TYPES[RandomUtils.nextInt(FONT_TYPES.length)], Font.BOLD, 26)); //设置x y 坐标 g.drawString(String.valueOf(charArray[i]), 15 * i + 5, 19 + RandomUtils.nextInt(8)); } } }